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Premium Member

hi all. I benefited from this site so many times - so it's time to give some thing back...
i just bought w140 (originally 2.8 petrol - now 300d)
the car was converted about 10 years ago by one of the best mercedes indie's in Ireland.
it's w140 with om606.910 non turbo straight 6 engine, automatic

LOVE S-class

so today i went to my friends garage and decided to change the fuel lines(there was air in the system), as i was at it - return lines were changed, fuel filter, oil filter and new oil, new glow plugs, modify intake manifold, belt tensioner and shock, cleaned IM from some of the gunk..... and some more

i took 2 10mm bolts (red arrows) from the top of fuel filter (it loosened vacuum line so i could take IM off without damaging vacuum). they were holding vacuum line (white arrow) and securing 3 fuel lines from coming out

Cruise Control

Nice write up. On my 606, I opted to convert all of the o-ring junctions back to the old style with the copper crush washers, since those rarely leak. What is the immobilizer you reference in the glow plug pic?

Premium Member

Nice write up. On my 606, I opted to convert all of the o-ring junctions back to the old style with the copper crush washers, since those rarely leak. What is the immobilizer you reference in the glow plug pic?

thanks a lot Zeitgeist. i've bought other glow plugs few days ago - you can see them in a picture- tread was same and size was very alike - but connection for wires is different. immobilizer ones have to be connected to ecu + IP + glow plugs (safety feature, anti theft)

i have connectors on IP not connected as well - so i assume they were never used because of the conversion - ecu is from w126, engine and gearbox w124, w140 chassis..........

Registered

Always replace fuel pre-filters and the filter in the fuel tank. Not worth taking a chance re-using such a cheap part when yours is looking so old an dirty.

Please update your profile so we know which vehicle you are referencing. The OM606 was only used on the '95 W124 in the US. The W140 initially had the OM603, but was superseded with the OM606. Only the OM603 was available in the US, which had the dreaded "rodbender" 3.5L turbodiesel.

Registered

I would most definitely also replace the main vacuum line running from the vacuum pump to the brake booster.

Yours is being held together with duct tape.

If that line lets go, you will lose brake assist and won't be able to shut off the engine since your main fuel filter does not have a manual shut off valve. This is a serious safety issue to yourself and to other motorists in addition to preventing a runaway diesel situation.

Premium Member

Always replace fuel pre-filters and the filter in the fuel tank. Not worth taking a chance re-using such a cheap part when yours is looking so old an dirty.

Please update your profile so we know which vehicle you are referencing. The OM606 was only used on the '95 W124 in the US. The W140 initially had the OM603, but was superseded with the OM606. Only the OM603 was available in the US, which had the dreaded "rodbender" 3.5L turbodiesel.

Premium Member

I would most definitely also replace the main vacuum line running from the vacuum pump to the brake booster.

Yours is being held together with duct tape.

If that line lets go, you will lose brake assist and won't be able to shut off the engine since your main fuel filter does not have a manual shut off valve. This is a serious safety issue to yourself and to other motorists in addition to preventing a runaway diesel situation.

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